Update scalafmt config

Author: adamw

.gitignore

@@ -17,6 +17,8 @@ project/plugins/project/
 .worksheet
 
 .idea*
+.vscode
+.scala-build
 
 .keys*
 

.scalafmt.conf

@@ -1,3 +1,8 @@
-runner.dialect = scala3
+runner.dialect = scala213
 version = 3.8.2
-maxColumn = 120
+maxColumn = 120
+fileOverride {
+  "glob:**/scala-3/**" {
+    runner.dialect = scala3
+  }
+}